// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include "test.h"

extern B2_API bool g_blockSolve;

class BoxStack : public Test
{
public:

  enum
  {
    e_columnCount = 1,
    e_rowCount = 15
    //e_columnCount = 1,
    //e_rowCount = 1
  };

  BoxStack()
  {
    {
      b2BodyDef bd;
      b2Body* ground = m_world->CreateBody(&bd);

      b2EdgeShape shape;
      shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
      ground->CreateFixture(&shape, 0.0f);

      shape.SetTwoSided(b2Vec2(20.0f, 0.0f), b2Vec2(20.0f, 20.0f));
      ground->CreateFixture(&shape, 0.0f);
    }

    float xs[5] = {0.0f, -10.0f, -5.0f, 5.0f, 10.0f};

    for (int32 j = 0; j < e_columnCount; ++j)
    {
      b2PolygonShape shape;
      shape.SetAsBox(0.5f, 0.5f);

      b2FixtureDef fd;
      fd.shape = &shape;
      fd.density = 1.0f;
      fd.friction = 0.3f;

      for (int i = 0; i < e_rowCount; ++i)
      {
        b2BodyDef bd;
        bd.type = b2_dynamicBody;

        int32 n = j * e_rowCount + i;
        b2Assert(n < e_rowCount * e_columnCount);
        m_indices[n] = n;
        bd.userData.pointer = n;

        float x = 0.0f;
        //float x = RandomFloat(-0.02f, 0.02f);
        //float x = i % 2 == 0 ? -0.01f : 0.01f;
        bd.position.Set(xs[j] + x, 0.55f + 1.1f * i);
        b2Body* body = m_world->CreateBody(&bd);

        m_bodies[n] = body;

        body->CreateFixture(&fd);
      }
    }

    m_bullet = NULL;
  }

  void Keyboard(int key) override
  {
    switch (key)
    {
    case GLFW_KEY_COMMA:
      if (m_bullet != NULL)
      {
        m_world->DestroyBody(m_bullet);
        m_bullet = NULL;
      }

      {
        b2CircleShape shape;
        shape.m_radius = 0.25f;

        b2FixtureDef fd;
        fd.shape = &shape;
        fd.density = 20.0f;
        fd.restitution = 0.05f;

        b2BodyDef bd;
        bd.type = b2_dynamicBody;
        bd.bullet = true;
        bd.position.Set(-31.0f, 5.0f);

        m_bullet = m_world->CreateBody(&bd);
        m_bullet->CreateFixture(&fd);

        m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
      }
      break;
                
        case GLFW_KEY_B:
            g_blockSolve = !g_blockSolve;
            break;
    }
  }

  void Step(Settings& settings) override
  {
    Test::Step(settings);
    g_debugDraw.DrawString(5, m_textLine, "Press: (,) to launch a bullet.");
    m_textLine += m_textIncrement;
    g_debugDraw.DrawString(5, m_textLine, "Blocksolve = %d", g_blockSolve);
    //if (m_stepCount == 300)
    //{
    //	if (m_bullet != NULL)
    //	{
    //		m_world->DestroyBody(m_bullet);
    //		m_bullet = NULL;
    //	}

    //	{
    //		b2CircleShape shape;
    //		shape.m_radius = 0.25f;

    //		b2FixtureDef fd;
    //		fd.shape = &shape;
    //		fd.density = 20.0f;
    //		fd.restitution = 0.05f;

    //		b2BodyDef bd;
    //		bd.type = b2_dynamicBody;
    //		bd.bullet = true;
    //		bd.position.Set(-31.0f, 5.0f);

    //		m_bullet = m_world->CreateBody(&bd);
    //		m_bullet->CreateFixture(&fd);

    //		m_bullet->SetLinearVelocity(b2Vec2(400.0f, 0.0f));
    //	}
    //}
  }

  static Test* Create()
  {
    return new BoxStack;
  }

  b2Body* m_bullet;
  b2Body* m_bodies[e_rowCount * e_columnCount];
  int32 m_indices[e_rowCount * e_columnCount];
};

static int testIndex = RegisterTest("Stacking", "Boxes", BoxStack::Create);
